Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd777830e82c572…

MALICIOUS

PDF

74.7 KB Created: 2021-09-19 03:29:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1b5277f371c22d8242e8861a1c7b2f4 SHA-1: bcfa8e4c1e0d8bfa89c80fcbe58b5253b9a73613 SHA-256: 2fd777830e82c57238b794063420682273a73561d4c81b5201da2420ff130a7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware-hosting sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://crewmak.ru/uplcv?utm_term=install+app+on+android+tv+from+phone PDF link annotation
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613661657382b---zowemusedudili.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144905fa8bd3---zadebur.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/94719632928.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/retavejuzamozemulup.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/vemibiwelu.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109010055178805.pdfIn PDF document text
    • http://parilka.by/var/upload/file/patazetevetakidofix.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/45886628666.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/31644802543.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/25717771899.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/devawiwutavigodinupisoku.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/39327938961.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/92606538908.pdfIn PDF document text
    • https://martabaktelor.com/contents/files/30955349063.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/pedewoto.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/71492251583.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/74313605536.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/zusinarageduta.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/44500485943.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/volixitetopunoxidukopa.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/90415953106.pdfIn PDF document text
    • http://xfswchem.com/upload/files/zofegenupepiluralob.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/95657040215.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27C 16308 bytes
SHA-256: bfa2a0c875a2502483233a98979d4763201a68af28c12ee8fb7374178d8fb23e
font_01_sfnt_off0000ec69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 10780 bytes
SHA-256: d4ee09b1d652ce00c7e7c2aa7b3c5fea6ed3111e8a747d8ed1da7b53b1353c88

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